What’s Vulnerable › Vulnerabilities

CVE-2023-32695: Insufficient validation when decoding a Socket.IO packet

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-05-27 · updated 2026-06-17
• Weakness: CWE-20

Description

socket.io parser is a socket.io encoder and decoder written in JavaScript complying with version 5 of socket.io-protocol. A specially crafted Socket.IO packet can trigger an uncaught exception on the Socket.IO server, thus killing the Node.js process. A patch has been released in version 4.2.3.

Affected products

• Socket.io-Parser: from 3.4.0 before 3.4.3; from 4.0.4 before 4.2.3 — fixed in 3.4.3, 4.2.3

How to fix

Upgrade to a fixed version: Socket.io-Parser 3.4.3, 4.2.3. Check the vendor advisory for mitigations.

References

• https://github.com/socketio/socket.io-parser/commit/2dc3c92622dad113b8676be06f23b1ed46b02ced
• https://github.com/socketio/socket.io-parser/commit/3b78117bf6ba7e99d7a5cfc1ba54d0477554a7f3
• https://github.com/socketio/socket.io-parser/releases/tag/4.2.3
• https://github.com/socketio/socket.io-parser/security/advisories/GHSA-cqmj-92xf-r6r9
• https://github.com/socketio/socket.io-parser/commit/2dc3c92622dad113b8676be06f23b1ed46b02ced
• https://github.com/socketio/socket.io-parser/commit/3b78117bf6ba7e99d7a5cfc1ba54d0477554a7f3
• https://github.com/socketio/socket.io-parser/releases/tag/4.2.3
• https://github.com/socketio/socket.io-parser/security/advisories/GHSA-cqmj-92xf-r6r9

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